摘要
本文结合云南天生桥面板堆石坝的试验研究,提出了一个非线性应力应变模型,即K-G模型。建议了一种用三轴试验直接求取残余强度的方法。预测表明:该模型能较好地模拟土的剪胀性和预测不同应力路径,在一定程度上能考虑中主应力σ_2对破坏的影响及应变软化性。所选的模型拟合曲线均为大家所熟知,旦参数易于用常规三轴试验(σ_3=c)确定,因而是一个具有实用价值的模型。
On the basis of systermatie investigations for coarse materials taking from Tian Shengqiao Electoie Power Station. A skill for the measurement of residual strength with triaxial apparatus is suggested. The tested residual friction angle, φr=43°30′, is in good agreement with the results of others. In catering of the different stress-strain behavious under loading, unloading and reloading. A new set constitutive models are developed. The Model is strong in the eapacity of prediction, capable of incorrporating dilatancy, intermednate principa lstress, stress path, and to an certain extent, taking softening into account, with so great a function, and so eonvinient a method to determine the parameters involved with a common triaxial apparatus, the model is one with application potetianl.
关键词
粗粒土
剪胀笥
中主应力
K-G模型
coarse meterials, K-G Model, ditalaney, intermediate prinapal stress, residual strength
